Question

Check whether 9 is a factor of 828​

Answer 1

it can only be a factor of 9 if 8+2+8 is divisible by 9

18= divisible by 9

hence, true

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Answer 2

$9 \: \: \: \: is \: \: \: \: factor \: \: \: \: of \: \: \: \: 828$